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1 ## Copyright (C) 1996 Auburn University. All rights reserved. |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by the |
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7 ## Free Software Foundation; either version 2, or (at your option) any |
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8 ## later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 ## for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{retval} =} freqchkw (@var{w}) |
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21 ## Used by @code{freqresp} to check that input frequency vector @var{w} |
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22 ## is valid. |
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23 ## Returns boolean value. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> |
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27 ## Created: July 1996 |
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28 |
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29 function USEW = freqchkw (w) |
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30 |
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31 if(isempty(w)) |
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32 USEW = 0; |
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33 elseif(!is_vector(w)) |
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34 error(["w (",num2str(rows(w)),"x",num2str(columns(w)), ... |
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35 "): must be [], a vector or a scalar"]); |
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36 elseif( (max(abs(imag(w))) != 0) && (min(real(w)) <= 0) ) |
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37 error("w must have real positive entries"); |
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38 else |
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39 w = sort(w); |
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40 USEW = 1; # vector provided (check values later) |
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41 endif |
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42 |
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43 endfunction |
